It is probably incorrect to say that any part of writing a research paper is easy but if you could, writing an abstract would be it. An abstract for a research paper is basically a synopsis of that paper. In far fewer words, the abstract tells the potential reader of the research paper exactly what they can expect to find. A good analogy would be the blurb on the back cover of a book. The book hunter reads the back cover to get an idea of what the book is about. That's what you're doing when you write a research paper abstract.
With a little work, your headlines can excite, entice and entertain. The best ones grab a reader’s attention in a short amount of space and lure him or her into a story. They create evocative thoughts and images. They summarize, smartly and succinctly, the meaning of what will follow. They don’t go on forever like an abstract for a research paper. (You can’t bore people into reading your story.)
How to write an abstract for a research paper
The scope of a research paper is narrow: It should present and substantiate one idea. The potential audience for a research paper possibly is also narrowunderstanding and appreciating it might require detailed and specialized knowledge. It should be possible to convey the idea of the paper to its intended audience in one or a few sentences. The title and abstract for a research paper should have the effect of inviting the intended audience and warning away others.